Powering ATX Motherboard on 12V Battery

[drycola]

Hello everyone,

I need to run an old ATX motherboard on 12V DC batteries instead of the powersupply. I need that for a robotics project.
I know that power supply provides +12V, -12V, +5V, & -5V DC to the motherboard and other components, but I'm little confused about the +12 and -12 issue, I mean can these be directly connected to the +ve and -ve output of the 12V battery??

My question in simple words: How can I run motherboard on 12V battery?

 

[jsc]

The voltage difference between +12 volts and -12 volts is 24 volts. You may not need the -12 volts for the motherboard. But you probably do need 3.3 volts (the orange wires) to power the memory.

The only way I see is to cobble together 5 and 3.3 volt regulators fed from the battery. They should be switching regulators for better efficiency.

 

[bilbat]

http://www.mini-box.com/Car-PC-Automotive-Computing-Solutions
http://www.logicsupply.com/industries/automotive_computing